Abstract: A ballast coil, transformer, and power factor capacitor are plug-in mounted on a PC-board which is mounted into a frame being covered to provide a complete, unpotted enclosure. The transformer and the coil are additionally fastened to the enclosure and the board, and additional heat dissipation is provided for. Several different examples are enclosed for toroidal and laminated core structures and different capacitor positions. The capacitor is retained additionally by a strap which is screwed to one or both of the inductive elements. Additional fastening and heat dissipation is combined in toroidal inductances, by using a central post traversing the board and screw, and being fastened to a cover wall.